chore: add publish workflow and fix gitignore

- Add .github/workflows/publish.yaml for auto-publish on tag push
- Fix .gitignore to not block .github/ directory

Author: Brian Madison

.github/workflows/publish.yaml

@@ -0,0 +1,34 @@
+name: Publish to NPM
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: read
+  id-token: write  # Required for OIDC
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run format check
+        run: npm run format:check
+
+      - name: Publish to NPM
+        run: npm publish --provenance
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}